This market refers to the tennis match between Matthew William Donald and Nicolas Mejia in the Mauthausen, originally scheduled for April 28, 2026 at 4:00AM ET. This market will resolve to 'Matthew William Donald' if Matthew William Donald advances against Nicolas Mejia. This market will resolve to 'Nicolas Mejia' if Nicolas Mejia advances against Matthew William Donald. If the match is canceled (not played at all), ends in a tie, or is delayed beyond 7 days from the scheduled date without a winner determined, this market will resolve to 50-50. If the match begins but is not completed, and one player advances due to the opponent's retirement, default, or disqualification, this market will resolve to the player who advances. If the match ends in a walkover (player withdraws before the start and the other advances automatically), this market will resolve to 50-50. The primary resolution source will be official information from the ATP Tour. A consensus of credible reporting may also be used.